estimating reservoir potential of wadis by waveform inversion and land streamers

Estimating Reservoir Potential of Wadis by Waveform Inversion and

Land Streamers

Motivation

To characterize the shallow subsurface at Wadi Qudaid for its water storage and reuse potential.

Area of Interest

KAUST

Collected Geophysical Data (Seismic Data)

Seismic DataCSG Samples

0.0

0.30.0 232

X (m)

Tim

e (s

)

0.0

0.30.0 232

X (m)

Tim

e (s

)

0.0

0.30.0 232

X (m)

Tim

e (s

)

0.0

0.30.0 232

X (m)

Tim

e (s

)

Data Processing

• Apply a bandpass filter of 15 ~ 70 Hz.

• Correct for the geometric spreading: 3D → 2D.

• Correct for attenuation by an estimated Q.

• Mute the near-offset traces within 14 m.

• Extract a natural source wavelet by averaging the near-offset

first arrivals.

Seismic Result

Collected Geophysical Data (Resistivity Data)

P1

P2

Resistivity Result

P1

P2

Land Streamer Test

Test # 1Saudi Arabia

Land Streamer

Geophysical Field Laboratory at KAUST has- 5 land streamers- P-wave geophones- 24-channel at each streamer- Up to 2 m geophone interval

Test # 1

- Data are collected at Saudi Arabia- Two parallel lines are collected- The first is a conventional seismic profile, where geophones

are planted in the ground- The second is a land streamer survey

1.5 m

Land Streamer

Shot Location

Conventional Seismic

Trace Comparison

a) CSG # 74, Convention Seismic Data0

0.2

Tim

e (s)

93 153X (m)

Trace Comparison

b) CSG # 74, Land Streamer Seismic Data0

0.2

Tim

e (s)

93 153X (m)

Land Streamer Test

Test # 2Robotec Survey

Utah, USA

Test # 2Robotic Land Streamer

- Data are collected at Utah, USA- One profile is collected with 10 CSGs- In each shot gather the land streamer moved 10 times to

give a total number of traces/shot gather of 231

Position 1 Position 2 Position 3 Position 10…………

Shot Loc.

Test # 2CSG Sample

0.0

5500.0 17.56

X (m)

Sam

ple

Sample interval = 2 ms